Walsun 40G QSFP+ LR4 Transceiver

About Walsun 40G QSFP+ LR4 Optical Transceiver Module in Bangladesh

The Walsun 40G QSFP+ LR4 is a high-performance 40Gbps optical transceiver designed for long-distance Ethernet connectivity over single-mode fiber. It uses four CWDM optical channels around the 1310nm wavelength region and combines them through a duplex LC interface to deliver an aggregate 40Gbps data connection.

Walsun's official product information identifies the standard 10km LR4 variant as HXQX-QL311C. It supports 40Gbps operation, up to 11.2Gb/s per optical channel, 1310nm wavelength, 10km transmission over single-mode fiber, DDM, QSFP+ MSA compliance and electrical hot-plugging. Walsun official 40G QSFP+ LR4 specifications

Walsun 40G QSFP+ LR4 Specifications & Features

Overview

The Walsun 40G QSFP+ LR4 provides a compact 40Gbps solution for switch-to-switch, router-to-router and data center backbone connectivity. Unlike 40G SR4 modules that use MPO/MTP connectors and multimode fiber, the LR4 uses duplex LC connectivity and single-mode fiber for transmission distances of up to 10km.

Walsun describes the 40G LR4 as a four-channel CWDM optical module in which each channel operates at up to 11.2Gb/s. The four optical wavelengths are multiplexed into a single duplex LC fiber connection. Walsun LR4 technical information

Buy Walsun 40G QSFP+ LR4 in Bangladesh

Purchase the Walsun 40G QSFP+ LR4 Optical Transceiver Module from Datacom Technologies (BD). We supply Walsun QSFP+ optical transceivers, 40G LR4/ER4 modules, single-mode fiber optics and enterprise/data center networking solutions throughout Bangladesh.

Key Features

• 40Gbps aggregate optical bandwidth
• 4 × 10Gbps-class optical channels
• 4-channel CWDM architecture
• 1310nm-class optical operation
• 1271nm / 1291nm / 1311nm / 1331nm wavelengths
• Up to 10km transmission distance
• Single-mode fiber support
• Duplex LC optical interface
• DFB laser transmitters
• PIN receivers
• Digital Diagnostic Monitoring
• Electrically hot-pluggable QSFP+ design
• QSFP+ MSA compliant
• RoHS-6 compliant
• 0°C to 70°C operating temperature

40G QSFP+ LR4 Optical Technology

The Walsun 40G QSFP+ LR4 converts four independent electrical data streams into four optical channels. Each channel operates at up to 11.2Gb/s. The four wavelengths are multiplexed together before transmission through the duplex LC single-mode fiber connection.

At the receiving end, the optical signal is demultiplexed back into four individual wavelengths and converted into electrical signals. This architecture enables a 40Gbps aggregate connection using only one duplex pair of single-mode fibers.

Four CWDM Optical Channels

The Walsun 40G QSFP+ LR4 uses four CWDM wavelengths centered around the 1310nm optical window. Walsun's technical documentation identifies the channels as approximately 1271nm, 1291nm, 1311nm and 1331nm. Walsun 40G QSFP+ technical guide

The four optical channels are combined through an internal MUX and transmitted over the same fiber pair.

10km Single-Mode Fiber Reach

The standard Walsun LR4 variant supports transmission distances of up to 10km over compatible single-mode fiber.

This makes it suitable for data center interconnection, enterprise backbone links, metro access networks, switch-to-switch connections and other 40GbE applications requiring more reach than multimode SR4 optics can provide.

The actual achievable distance depends on fiber attenuation, connector losses, splice losses, dispersion and the total optical link budget.

Duplex LC Connectivity

The Walsun 40G QSFP+ LR4 uses a duplex LC optical interface. One single-mode fiber carries the transmit signal and the second fiber carries the receive signal.

This differs from 40G SR4, which typically uses an MPO/MTP interface with multiple multimode fibers.

DFB Transmitter and PIN Receiver

The 10km HXQX-QL311C LR4 variant uses DFB laser transmitters and PIN photodetectors. The four DFB lasers operate at the four CWDM wavelengths and the internal MUX combines their optical outputs.

Walsun specifies transmit power from approximately -7.0 to +2.3dBm and receiver sensitivity better than -13.5dBm for this 10km variant. Walsun official specifications

Digital Diagnostic Monitoring

The module supports a Digital Diagnostic Monitoring interface. When the host switch or router supports optical diagnostics, network administrators can monitor important module operating parameters for troubleshooting and maintenance.

Hot-Pluggable QSFP+ Design

The Walsun LR4 uses the compact QSFP+ form factor and is electrically hot-pluggable. This allows the transceiver to be installed or replaced in compatible networking equipment without shutting down the entire system.

The high-density QSFP+ design provides 40Gbps connectivity while occupying substantially less front-panel space than multiple individual 10G optical modules.

40G QSFP+ LR4 vs 40G QSFP+ SR4

Walsun confirms that 40G LR4 uses duplex LC and single-mode fiber for up to 10km, while 40G SR4 uses MPO/MTP and multimode fiber for short-distance links. Walsun 40G QSFP+ interface guide

40G QSFP+ LR4 vs 40G QSFP+ ER4

Walsun's product family includes separate LR4 and ER4 configurations. The standard LR4 reaches 10km, while the 40km ER4 version uses a higher-power optical architecture and APD receiver. Walsun 40G QSFP+ product information

Enterprise, Data Center & Metro Applications

• 40GbE data center interconnection
• Switch-to-switch backbone links
• Enterprise network aggregation
• Metro Ethernet
• Internet Exchange Point connectivity
• Data center-to-data center links
• Router-to-router optical connectivity
• High-capacity campus backbones
• Telecom network aggregation
• 40G Ethernet infrastructure

Compatibility

Walsun states that its 40G QSFP+ optical modules can be supplied for compatibility with major networking platforms including Cisco, Huawei, H3C, Ruijie and other switch manufacturers. Walsun compatibility information

When purchasing, the exact switch, router or optical transport platform should be specified so the appropriate vendor-coded module can be supplied.

Installation Considerations

• Use compatible 9/125µm single-mode fiber.
• Use duplex LC fiber connectors.
• Verify the complete 10km optical link budget.
• Check fiber attenuation and connector/splice losses.
• Clean and inspect LC connectors before installation.
• Verify QSFP+ host compatibility.
• Confirm the required vendor coding before purchase.
• Ensure both ends use compatible 40G LR4 optical specifications.

Benefits

• 40Gbps aggregate bandwidth
• Four CWDM optical channels
• Up to 10km SMF transmission
• 1310nm-class optical operation
• Duplex LC connectivity
• Compact QSFP+ form factor
• DFB transmitters
• PIN receivers
• Digital diagnostic monitoring
• Hot-pluggable installation
• QSFP+ MSA compliance
• Suitable for enterprise, data center and metro networks

Why Buy from Datacom Technologies (BD)?

Datacom Technologies (BD) supplies Walsun 40G QSFP+ LR4 optical transceivers, 40G SR4/ER4 modules, single-mode fiber optics and enterprise/data center networking products in Bangladesh. Customers can receive competitive pricing, technical consultation, compatibility guidance and nationwide delivery.

• Call/WhatsApp: +8801748173213
• Email: sales@datacomtechbd.com
• Alternative Email: datacomtechnologiesbd@gmail.com
• Office: Tropical Center, 218, Dr. Kudroti Khuda Road, New Elephant Road, Dhaka-1205, Bangladesh

Frequently Asked Questions (FAQ)

Q1: What is the Walsun 40G QSFP+ LR4?
It is a 40Gbps QSFP+ optical transceiver designed for up to 10km transmission over single-mode fiber using four CWDM wavelengths.

Q2: What is the Walsun part number for the standard 10km LR4?
The official Walsun ordering table identifies the 10km LR4 variant as HXQX-QL311C.

Q3: What wavelengths does the LR4 use?
The four CWDM channels are approximately 1271nm, 1291nm, 1311nm and 1331nm.

Q4: What type of fiber is required?
The LR4 requires single-mode fiber, typically 9/125µm SMF.

Q5: What connector does it use?
It uses a duplex LC optical connector.

Q6: What is the maximum reach?
The standard Walsun LR4 variant supports up to 10km.

Q7: Does it support DDM?
Yes. Walsun specifies support for a Digital Diagnostic Monitoring interface.

Q8: What transmitter and receiver does it use?
The 10km HXQX-QL311C uses DFB lasers and PIN receivers.

Q9: What is the transmit power?
Walsun specifies -7.0 to +2.3dBm for the 10km LR4 variant.

Q10: What is the receiver sensitivity?
Walsun specifies receiver sensitivity better than -13.5dBm for the standard 10km LR4 variant.

Q11: Is 40G LR4 compatible with 40G SR4?
Both are 40Gbps QSFP+ technologies, but they use different optical interfaces and fiber types. LR4 uses duplex LC single-mode fiber, while SR4 uses MPO/MTP multimode fiber.

Q12: Where can I buy Walsun 40G QSFP+ LR4 in Bangladesh?
You can contact Datacom Technologies (BD) for Walsun 40G QSFP+ LR4 optical transceivers, 40G networking optics and enterprise/data center fiber solutions with nationwide delivery.